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I have a zex wet kit adjustable from 55-75 HP. I would NOT recommend Zex since the Solenoid got stuck open. I think NX has limetime warranty on their soleniods.
Not sure how much Proflow TB adds. I had it on before my SC.
As for the toda headers, I just got them installed a couple weeks ago.
Here is a plot I logged with PDA-Dyno.
Blue is stock header
Pink/purple is with toda header and additional fuel tuning
Orange is toda header tuned
The scale didn't show on this picture. Each horizontal line is 20 whp. Bottom horizontal line is 40 HP (x-axis) and top line is 320 HP. PDA dyno only captures up to about 8000 rpm using a 3rd gear pull.
Haven't hit a real dyno yet with the Toda headers. Hopefully sometime in the next couple weeks.